-----Original Message-----
From: Simon Y. Blackwell
Sent: Wednesday, May 23, 2001 2:03 AM
To: 'Hal Lockhart'
Subject: RE: XACML Charter Scope
Given that I actually dreamt about this issue tonight and am now up thinking
about it (boy am I sick ;-), suffice it to say that I concur with Hal.
I do think it should be possible to use existing protocols to query an XACML
repository and exchange messages. SAML should certainly play a role here. My
guess is XPath or XQuery might also.
> -----Original Message-----
> From: Hal Lockhart [mailto:]
> Sent: Monday, May 21, 2001 12:48 PM
> To: ''
> Subject: XACML Charter Scope
>
>
> I observed on the concall today that the proposed charter
> says the purpose
> "is to define a core schema and corresponding namespace." I
> said that this
> alone did not seem to me to be sufficient to allow interoperable
> implementations to be developed without some statement about
> how documents
> defined by this schema might be exchanged.
>
> On reflection, I concede that for some applications it would probably
> suffice to say that the document would be generated as a disk file and
> exchanged by any method of choice. However, it is possible that the TC
> wishes to go further. If XACML messages are intended to be
> associated with
> control of access to portions of XML documents, it seems it
> would be useful
> to describe how they would be contained in or bound to the
> document to which
> they refer. If XACML is to be used to provision an access
> control system,
> then a protocol for requesting and receiving messages might
> be useful.
>
> Increasing the scope in this way would in no way commit us to
> inventing
> these mechanisms from scratch. It would be sufficient to reference a
> suitable standard developed elsewhere.
>
> Hal
>
